river 97 miles (156 kilometers) SE Scotland & NE England flowing E into North Sea
Medium- to heavy-weight fabric, rough in surface texture, produced in a great variety of colour and weave effects (seeweaving). Most tweeds are made entirely of wool, but an increasing number are blends of wool with cotton, rayon, or other synthetic fibres. Most are woven from dyed yarns, but some are dyed after being woven. Technical advances in dyeing raw stock, yarns, and fabrics, together with new techniques in finishing, have resulted in a wide variety of durable cloths.